Best Summer Flowers: 15 Blooms That Thrive in the Heat
Summer is when flowers show off. Gardens hit their stride, farm stands overflow, and bouquets turn bold and bright. Not every bloom loves a heat wave, though. Some flowers wilt the moment temperatures climb, while others seem to improve with every sunny day.
So which summer flowers are worth planting or sending? Our designers work with thousands of stems every week, and we see which blooms hold up in July heat. Here are the 15 best summer flowers for gardens, vases, and gifts, plus simple tips to keep them looking fresh.
What Makes a Great Summer Flower?
Three qualities separate true summer flowers from the rest. First, heat tolerance: the best summer blooms keep flowering through 90-degree afternoons in full sun. Second, a long season: many of the flowers below bloom from early summer until the first frost. Third, vase life: warm rooms shorten the life of cut stems, so summer favorites need staying power.
Plenty of flowers meet all three tests. These are the ones florists and gardeners reach for first.
The 15 Best Summer Flowers
1. Sunflowers
No flower says summer like a sunflower. Their sturdy stems and bold faces last more than a week in the vase, and they bloom reliably through the hottest months. A sunflower bouquet is an instant mood-lifter for birthdays, thank-yous, and everyday celebrations.
2. Hydrangeas
Those big, cloud-like blooms are a summer classic for a reason. Hydrangeas fill out gardens, wedding arrangements, and vases with almost no effort, and their flowers in shades of blue, pink, and white suit every style. They love water, so keep them well hydrated in the heat.
3. Zinnias
Zinnias are among the hardest-working flowers for summer gardens. Heat and drought tolerant, they bloom in nearly every color, and the more you cut them, the more they flower. Gardeners call them "cut and come again" for good reason.
4. Dahlias
From small pompons to dinner-plate blooms, dahlias are the showstoppers of late summer. Their bloom time runs from July until early fall, and they bring instant drama to arrangements.
5. Lilies
Lilies bring fragrance and elegance to the warmest months. Each stem of these trumpet shaped flowers carries several buds that open one after another, so the show lasts for days. Browse lily bouquets and arrangements for a dramatic summer gift.
6. Roses
Garden roses repeat-bloom all summer with steady deadheading. As cut flowers, they remain the standard for romance, anniversaries, and just-because gifts, even in the heat.
7. Gerbera Daisies
Gerberas bloom in pure, crayon-bright colors that feel made for summer. Cheerful and eye catching, they are a favorite for birthdays and get-well wishes alike.
8. Snapdragons
Snapdragons add height and a playful shape to summer bouquets. Their spikes of tubular flowers open from the bottom up, giving you weeks of color in the garden.
9. Lisianthus
Often mistaken for roses, lisianthus blooms are ruffled, romantic, and surprisingly tough. Cut stems can last two weeks or more, which makes them a summer workhorse for florists.
10. Delphinium
True blue is rare in the flower world, and delphinium delivers it in dramatic spires that can reach six feet tall. It pairs beautifully with sunflowers and white hydrangeas for a crisp summer look.
11. Alstroemeria
Also called Peruvian lilies, alstroemeria stems carry clusters of blooms that last up to two weeks in a vase. They symbolize friendship and devotion, which makes them a thoughtful summer gift.
12. Marigolds
Marigolds thrive on sunshine and neglect. Their orange, yellow, and copper blooms keep coming all season, and they help protect vegetable gardens from pests.
13. Cosmos
Light, airy, and constantly in motion, cosmos bloom from early summer until frost. They give cottage style gardens a wildflower feel and fill out bouquets with delicate texture.
14. Black-Eyed Susans
These golden native wildflowers handle drought, heat, and poor soil without complaint. Pollinator friendly and long blooming, they feed bees and butterflies for months.
15. Gladiolus
Gladiolus sends up sword-like stems, often four feet tall, packed with long blooms that open bottom to top. One or two stems add instant height to any arrangement.
Which Flowers Bloom All Summer Long?
For nonstop color from June to frost, plant zinnias, marigolds, cosmos, and black-eyed Susans. All four are flowers that bloom all summer with one simple habit: deadheading. Snip spent blooms every few days and the plants respond with more buds. In pots, add gerbera daisies and geraniums for the same all-season effect.
How to Grow a Summer Cutting Garden
A few rows of the right flowers for summer can supply your vases from June through early fall. Keep these basics in mind:
- Choose a sunny spot. Most summer bloomers want six or more hours of full sun each day.
- Prepare the soil. Well drained soil enriched with compost keeps roots healthy through hot spells.
- Plan your flower beds by height. Tall gladiolus and delphinium in back, zinnias and marigolds in the middle, low growers up front.
- Stagger your planting. Sow zinnia and cosmos seeds every two weeks in early summer to extend the bloom time deep into September.
- Cut in the morning. Stems are fully hydrated at dawn, so morning-cut flowers last longest in the vase.
Choose heat and drought tolerant varieties, and the garden will forgive you for skipping a watering day in August.
How to Keep Summer Flowers Fresh in the Heat
Cut flowers work harder in warm weather, and a few habits make a measurable difference:
- Recut stems at an angle before they go in water, and again every few days.
- Use cool water and change it every two days.
- Keep the vase away from direct sun, ripening fruit, and heat vents.
- Strip any leaves that sit below the waterline.
- Use the flower food packet. The nutrients extend vase life by several days.
With this routine, most summer flowers last a full week. Tough varieties like alstroemeria, lisianthus, and sunflowers often go well beyond that.
Summer Flower Arrangement Ideas
To bring the season indoors, start with combinations our designers rely on:
- Sunshine and sky: sunflowers with blue delphinium and white daisies.
- Soft summer pastels: hydrangeas with garden roses and lisianthus.
- Farm stand brights: brightly colored flowers like zinnias, snapdragons, and gerberas in a mason jar.
Prefer to leave the designing to us? Explore our summer flower arrangements or send a hand-designed mixed bouquet. For fresh stems on repeat, a monthly flower subscription keeps the best summer flowers coming all season.
Summer Flowers for Weddings and Events
Summer remains the most popular wedding season, and the flowers above are the backbone of warm-weather celebrations. Hydrangeas and garden roses form lush, romantic centerpieces.
Delphinium and gladiolus give ceremony arrangements height. Lisianthus stands in for roses in bridal bouquets and handles a long reception without wilting.
Planning a summer event? Our guide to the perfect summer wedding bouquet covers the blooms that stay fresh from ceremony to send-off.
Ordering Summer Flowers for Delivery
Heat is the enemy of a shipped flower box. Local florist delivery solves the problem: arrangements travel in water, inside a cooled van, for minutes instead of days.
Order in the morning for the best selection of seasonal stems. Choose blooms known for stamina, such as sunflowers, alstroemeria, and lisianthus, if the recipient may be away from home. When the forecast shows a heat wave, request an earlier delivery window so the bouquet never sits in the afternoon sun.
Bring Summer Home
Summer flowers do not ask for much: sunshine, water, and someone to enjoy them. These 15 blooms deliver lasting color in the garden and in the vase. The season starts with June sunflowers and ends with the last dahlias of early fall. For more seasonal inspiration, see our guide to the top spring flowers as well.
James Cress Florist has designed with the best of every season for more than a century. Browse the summer collection, or schedule same-day flower delivery and make someone's day a little brighter.